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scala.tools.nsc.transform.patmat.Interface

MatchMonadInterface

trait MatchMonadInterface extends AnyRef

Interface with user-defined match monad? if there's a __match in scope, we use this as the match strategy, assuming it conforms to MatchStrategy as defined below:

type Matcher[P[_], M[+_], A] = {
  def flatMap[B](f: P[A] => M[B]): M[B]
  def orElse[B >: A](alternative: => M[B]): M[B]
}

abstract class MatchStrategy[P[_], M[+_]] {
  // runs the matcher on the given input
  def runOrElse[T, U](in: P[T])(matcher: P[T] => M[U]): P[U]

  def zero: M[Nothing]
  def one[T](x: P[T]): M[T]
  def guard[T](cond: P[Boolean], then: => P[T]): M[T]
}

P and M are derived from one's signature (def one[T](x: P[T]): M[T])

if no __match is found, we assume the following implementation (and generate optimized code accordingly)

object __match extends MatchStrategy[({type Id[x] = x})#Id, Option] {
  def zero = None
  def one[T](x: T) = Some(x)
  // NOTE: guard's return type must be of the shape M[T], where M is the monad in which the pattern match should be interpreted
  def guard[T](cond: Boolean, then: => T): Option[T] = if(cond) Some(then) else None
  def runOrElse[T, U](x: T)(f: T => Option[U]): U = f(x) getOrElse (throw new MatchError(x))
}
Source
PatternMatching.scala
Linear Supertypes
AnyRef, Any
Known Subclasses
TypedSubstitution, MatchAnalyzer, MatchApproximator, CodegenCore, OptimizedCodegen, PureCodegen, PureMatchMonadInterface, CommonSubconditionElimination, MatchOptimizer, SwitchEmission, MatchTranslator, TreeMakers, OptimizingMatchTranslator, PureMatchTranslator
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Inherited
  1. MatchMonadInterface
  2. AnyRef
  3. Any
Implicitly
  1. by any2stringadd
  2. by StringFormat
  3. by Ensuring
  4. by ArrowAssoc
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Visibility
  1. Public
  2. All

Abstract Value Members

  1. abstract val typer: (analyzer)#Typer

Concrete Value Members

  1. final def !=(arg0: Any): Boolean
    Definition Classes
    AnyRef → Any
  2. final def ##(): Int
    Definition Classes
    AnyRef → Any
  3. def +(other: String): String
    Implicit
    This member is added by an implicit conversion from MatchMonadInterface to any2stringadd[MatchMonadInterface] performed by method any2stringadd in scala.Predef.
    Definition Classes
    any2stringadd
  4. def ->[B](y: B): (MatchMonadInterface, B)
    Implicit
    This member is added by an implicit conversion from MatchMonadInterface to ArrowAssoc[MatchMonadInterface] performed by method ArrowAssoc in scala.Predef.
    Definition Classes
    ArrowAssoc
    Annotations
    @inline()
  5. final def ==(arg0: Any): Boolean
    Definition Classes
    AnyRef → Any
  6. final def asInstanceOf[T0]: T0
    Definition Classes
    Any
  7. def clone(): AnyRef
    Attributes
    protected[java.lang]
    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  8. def ensuring(cond: (MatchMonadInterface) ⇒ Boolean, msg: ⇒ Any): MatchMonadInterface
    Implicit
    This member is added by an implicit conversion from MatchMonadInterface to Ensuring[MatchMonadInterface] performed by method Ensuring in scala.Predef.
    Definition Classes
    Ensuring
  9. def ensuring(cond: (MatchMonadInterface) ⇒ Boolean): MatchMonadInterface
    Implicit
    This member is added by an implicit conversion from MatchMonadInterface to Ensuring[MatchMonadInterface] performed by method Ensuring in scala.Predef.
    Definition Classes
    Ensuring
  10. def ensuring(cond: Boolean, msg: ⇒ Any): MatchMonadInterface
    Implicit
    This member is added by an implicit conversion from MatchMonadInterface to Ensuring[MatchMonadInterface] performed by method Ensuring in scala.Predef.
    Definition Classes
    Ensuring
  11. def ensuring(cond: Boolean): MatchMonadInterface
    Implicit
    This member is added by an implicit conversion from MatchMonadInterface to Ensuring[MatchMonadInterface] performed by method Ensuring in scala.Predef.
    Definition Classes
    Ensuring
  12. final def eq(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef
  13. def equals(arg0: Any): Boolean
    Definition Classes
    AnyRef → Any
  14. def finalize(): Unit
    Attributes
    protected[java.lang]
    Definition Classes
    AnyRef
    Annotations
    @throws( classOf[java.lang.Throwable] )
  15. def formatted(fmtstr: String): String
    Implicit
    This member is added by an implicit conversion from MatchMonadInterface to StringFormat[MatchMonadInterface] performed by method StringFormat in scala.Predef.
    Definition Classes
    StringFormat
    Annotations
    @inline()
  16. final def getClass(): Class[_]
    Definition Classes
    AnyRef → Any
  17. def hashCode(): Int
    Definition Classes
    AnyRef → Any
  18. final def isInstanceOf[T0]: Boolean
    Definition Classes
    Any
  19. val matchOwner: Global.Symbol
  20. final def ne(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef
  21. final def notify(): Unit
    Definition Classes
    AnyRef
  22. final def notifyAll(): Unit
    Definition Classes
    AnyRef
  23. def pureType(tp: Global.Type): Global.Type
  24. def reportMissingCases(pos: Global.Position, counterExamples: List[String]): Unit
  25. def reportUnreachable(pos: Global.Position): Unit
  26. final def synchronized[T0](arg0: ⇒ T0): T0
    Definition Classes
    AnyRef
  27. def toString(): String
    Definition Classes
    AnyRef → Any
  28. final def wait(): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  29. final def wait(arg0: Long, arg1: Int): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  30. final def wait(arg0: Long): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  31. def →[B](y: B): (MatchMonadInterface, B)
    Implicit
    This member is added by an implicit conversion from MatchMonadInterface to ArrowAssoc[MatchMonadInterface] performed by method ArrowAssoc in scala.Predef.
    Definition Classes
    ArrowAssoc

Inherited from AnyRef

Inherited from Any

Inherited by implicit conversion any2stringadd from MatchMonadInterface to any2stringadd[MatchMonadInterface]

Inherited by implicit conversion StringFormat from MatchMonadInterface to StringFormat[MatchMonadInterface]

Inherited by implicit conversion Ensuring from MatchMonadInterface to Ensuring[MatchMonadInterface]

Inherited by implicit conversion ArrowAssoc from MatchMonadInterface to ArrowAssoc[MatchMonadInterface]

Ungrouped